Diagnostic Sheet [Nc60] - Xerox DocuPrint C55 Service Manual

Diagnostic Sheet [NC60]

This test pattern can be used by the Help
Center to determine the status of some of the
machine parameters.
General Information:
Serial Number xxx-xxxxxxx - Printer Serial Number.
Software Version: - Current ESS Software version.
Engine Software Version: - current IOT
Software version.
Total Memory Installed : - Total Ram installed
in Printer. Max used 128 MB
Binary/Contone Lossy Counters - The NC60
printer uses compression and decompression
to save memory. However, if the job is very
complex, lossy compression may be used.
The printer will still try to print the job however
data may be lost. If this occurs, the Lossy
Counters will increment. Add more memory
to fix this problem.
Humidity/Temperature counts - These read-
ings are used to adjust the copy quality to the
environment. If these readings are extreme
(0 or 255) the Temperature/Humidity sensor
is not working properly.
Fuser Temp: - This count represents fuser
temperature. The following values are
normal:
Transparencies 160
Warm-up 150
Paper 140
Print Counts
The number of Total, Black, Cyan, Magenta,
and Yellow prints made on the NC60.
Consumables Usage Status
These readings track the prints and images
used by the various consumables.
readings will be reset to zero when a new
consumable is installed.
Adjustments
These readings are stored in the ESS. If the
ESS is replaced, these values will need to be
re-entered.
IMAGE QUALITY SPECIFICATIONS
TEST PATTERNS
Process Control Status:
If Black, Cyan, Magenta, or Yellow, indicate:
Under Limit Error - Process controls thinks
the prints are too light even at the highest
bias.
Over Limit Error - Process controls thinks
the prints are too dark even at the lowest
bias.
Irregular Error - The Gamma Sensor did not
see the expected difference between the 3
patches during setup.
Possible causes for Under
Irregular errors tend to be the same:
•
Transfer Nip too small, or poor transfer in
general.
•
Toner concentration in the developer
assembly is too low.
causing excessive toner consumption.
•
Very low Relative Humidity. Magenta is
especially sensitive to this problem. The
error occurs if Relative Humidity is less
than 10 counts (General information on
Diagnostic sheet).
•
Developer assembly problem.
•
High Voltage Power supply problem.
Possible causes for Over Limit errors:
•
Very high Relative Humidity. The error
occurs if Relative Humidity is greater than
35 counts (General
Diagnostic sheet).
•
Dirty white patch on transfer drum.
The toner concentration in the developer
assembly is too high.
Calibration Errors occur when reading the
These
white patch, and the difference between full
Gamma voltage and half Gamma voltage is
not what was expected. Suspect a dirty white
patch or bad Gamma Sensor.
Density Rate Setpoints:
The default is 90, If the Density and Color
Balance has been adjusted, these setpoints
will change.
100. If the Density and Color Balance tries to
exceed a limit, the process control will indicate
an over or under error.
approximately 10 Volts of developer bias
Gamma Set Points
These are internal setpoints and are the same
for all printers.
Toner Concentration:
Limit and
Setpoint - The default is 70.
developer assembly is installed, the toner
concentration sensor " reads" the new housing
and the setpoints are entered in NVM. These
setpoints are critical for proper copy quality
Arcing may be
and must be re-entered if the PCU PWB is
replaced or the NVM is initialized. If the NVM
is accidentally initialized, the setpoints can be
obtained from the Diagnostic sheet and re-
entered into NVM.
Control Point - This is the value that the toner
concentration
assembly tries to maintain. The control point
uses the setpoint as a starting point and then
varies depending on the temperature and
relative humidity. In high humidity conditions,
the value is increased and in low humidity
conditions, the value is decreased.
information on
The Black value varies between − 20 to + 27.
The Color value varies between − 28 to + 22
Value - The values are measured by the toner
concentration sensors during the print cycle
and determine when toner needs to be added
to the developer assembly. The value usually
does not equal the control point exactly, but is
generally within 5 counts.
2/99
3-24
The range is between 80 and
One count is
When a new
sensor in the developer
DocuPrint NC60